Dihydromyricetin inhibits microglial activation and neuroinflammation by suppressing NLRP3 inflammasome activation in APP/PS1 transgenic mice

Jun 6, 2018CNS neuroscience & therapeutics

Dihydromyricetin reduces brain immune cell activation and inflammation by blocking a key inflammatory pathway in Alzheimer's model mice

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Abstract

treatment significantly ameliorated memory and cognition deficits in APP/PS1 transgenic mice.

Dihydromyricetin decreased the number of activated microglia in the hippocampus and cortex of APP/PS1 mice.
Treatment with Dihydromyricetin reduced activation of NLRP3 inflammasomes and expression of their components.
Dihydromyricetin may enhance clearance of amyloid β by increasing levels of neprilysin.
The treatment shifted microglial conversion to a phenotype that promotes clearance of amyloid β aggregates.

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BACKGROUND: Activated microglia-mediated inflammation plays a key role in the pathogenesis of Alzheimer's disease (AD). In addition, chronic activation of NLRP3 inflammasomes triggered by amyloid β peptide (Aβ) in microglia contributes to persistent neuroinflammation. Here, the primary goal was to assess whether (DHM), a plant flavonoid compound, is effective therapies for AD; it is crucial to know whether DHM will affect microglial activation and neuroinflammation in APP/PS1 transgenic mice.

METHODS: After DHM was intraperitoneally injected in APP/PS1 double-transgenic mice, we assessed the effect of DHM on microglial activation, the expression of components, and the production of inflammatory cytokine IL-1β by immunofluorescence and Western blot. To determine whether DHM play roles in the Aβ production and deposition, amyloid β protein precursor (APP) and β-site APP cleaving enzyme1 (BACE1), as well as neprilysin (NEP), were detected by Western blot. Finally, behavior was tested by Morris Water Maze to illustrate whether DHM treatment has a significantly positive effect on ameliorating the memory and cognition deficits in AD.

RESULTS: Dihydromyricetin treatment significantly ameliorated memory and cognition deficits and decreased the number of activated microglia in the hippocampus and cortex of APP/PS1 mice. In addition, APP/PS1 mice show reduced activation of NLRP3 inflammasomes and reduced expression of NLRP3 inflammasome components. Furthermore, DHM could promote clearance of Aβ, a trigger for NLRP3 inflammasome activation, by increasing levels of NEP and shift microglial conversion to the M2-specific agrinase-1-positive cell phenotype, which enhances microglial clearance of Aβ and its aggregates but not production of Aβ.

CONCLUSION: Taken together, our findings suggest that DHM prevents progression of AD-like pathology through inhibition of NLRP3 inflammasome-based microglia-mediated neuroinflammation and may be a promising therapeutic drug for treating AD.

Key numbers

4 weeks

Decrease in Activated Microglia

treatment duration showing pronounced effects

shorter latency

Improvement in Cognitive Function

Morris water maze results for -treated APP/PS1 mice

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Dihydromyricetin inhibits microglial activation and neuroinflammation by suppressing NLRP3 inflammasome activation in APP/PS1 transgenic mice

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